In GNU ld, -Ttext sets the address of the .text section and -Ttext-segment sets the address of the text segment (RX).
gold only supports the -Ttext-segment semantic and treats -Ttext as an alias for -Ttext-segment.
lld only supports the -Ttext semantic and treats -Ttext-segment as an
alias for -Ttext. The text segment will be assigned to an address less
than the specified -Ttext-segment value.
This patch drops the -Ttext-segment alias.
The text segment is traditionally the first segment. Users who specify
-Ttext-segment may actually want to specify --image-base, the lld way to
express this. Unfortunately currently this is supported by GNU ld's
COFF port but not by its ELF port. gold does not support this option.
With -z separate-code, the behavior of GNU ld -Ttext-segment is weird (see https://sourceware.org/bugzilla/show_bug.cgi?id=25207)
rL289827 introduced the alias for linking qemu's non-pie user mode
binaries. As explained previously, this actually assigns the text
segment to an address less than 0x60000000. I feel that a better fix is
on the qemu side:
https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg02480.html
Reviewed By: grimar, ruiu
Differential Revision: https://reviews.llvm.org/D70468
if (config->splitStackAdjustSize < 0)
error("--split-stack-adjust-size: size must be >= 0");
+ // The text segment is traditionally the first segment, whose address equals
+ // the base address. However, lld places the R PT_LOAD first. -Ttext-segment
+ // is an old-fashioned option that does not play well with lld's layout.
+ // Suggest --image-base as a likely alternative.
+ if (args.hasArg(OPT_Ttext_segment))
+ error("-Ttext-segment is not supported. Use --image-base if you "
+ "intend to set the base address");
+
// Parse ELF{32,64}{LE,BE} and CPU type.
if (auto *arg = args.getLastArg(OPT_m)) {
StringRef s = arg->getValue();
defm Ttext: Eq<"Ttext", "Same as --section-start with .text as the sectionname">;
+def Ttext_segment: Separate<["-", "--"], "Ttext-segment">;
+
defm allow_multiple_definition: B<"allow-multiple-definition",
"Allow multiple definitions",
"Do not allow multiple definitions (default)">;
def: Flag<["-"], "s">, Alias<strip_all>, HelpText<"Alias for --strip-all">;
def: Flag<["-"], "S">, Alias<strip_debug>, HelpText<"Alias for --strip-debug">;
def: Flag<["-"], "t">, Alias<trace>, HelpText<"Alias for --trace">;
+def: Joined<["-", "--"], "Ttext-segment=">, Alias<Ttext_segment>;
def: JoinedOrSeparate<["-"], "y">, Alias<trace_symbol>, HelpText<"Alias for --trace-symbol">;
-def: Separate<["-", "--"], "Ttext-segment">, Alias<Ttext>, HelpText<"Alias for --Ttext">;
-def: Joined<["-", "--"], "Ttext-segment=">, Alias<Ttext>, HelpText<"Alias for --Ttext">;
def: JoinedOrSeparate<["-"], "u">, Alias<undefined>, HelpText<"Alias for --undefined">;
def: Flag<["-"], "V">, Alias<version>, HelpText<"Alias for --version">;
# RUN: ld.lld %t.o -Ttext=0x100000 -Tdata=0x110000 -Tbss=0x200000 -o %t4
# RUN: llvm-objdump -section-headers %t4 | FileCheck %s
-## Check Ttext-segment X and Ttext-segment=X forms.
-# RUN: ld.lld %t.o -Ttext-segment=0x100000 -Tdata=0x110000 -Tbss=0x200000 -o %t4
-# RUN: llvm-objdump -section-headers %t4 | FileCheck %s
-# RUN: ld.lld %t.o -Ttext-segment 0x100000 -Tdata=0x110000 -Tbss=0x200000 -o %t4
-# RUN: llvm-objdump -section-headers %t4 | FileCheck %s
-
## The same, but dropped "0x" prefix.
# RUN: ld.lld %t.o -Ttext=100000 -Tdata=110000 -Tbss=200000 -o %t5
# RUN: llvm-objdump -section-headers %t5 | FileCheck %s
--- /dev/null
+# REQUIRES: x86
+## Check that we emit an error for -Ttext-segment.
+
+# RUN: llvm-mc -filetype=obj -triple=x86_64 /dev/null -o %t.o
+# RUN: not ld.lld %t.o -Ttext-segment=0x100000 -o /dev/null 2>&1 | FileCheck %s
+# RUN: not ld.lld %t.o -Ttext-segment 0x100000 -o /dev/null 2>&1 | FileCheck %s
+
+# CHECK: error: -Ttext-segment is not supported. Use --image-base if you intend to set the base address